Keyboard



FIG. 1 is a top front perspective view of a keyboard showing the claimed design;

FIG. 2 is an enlarged view of a key shown in FIG. 1;

FIG. 3 is a front view of the keyboard;

FIG. 4 is a rear view thereof,

FIG. 5 is a left side view thereof,

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines in the figures show portions of the keyboard and environment that form no part of the claimed design. 

CLAIM The ornamental design for a keyboard, as shown and described. 